For flashing, kindly connect a Type-C cable to USB Type-C port, as this port is used for the USB-OTG interface. Also, please ensure the cable supports data transfer.
Regarding the OTG detection issue during flashing, please keep the switch set to 0001 and ensure that the 4th bit in switch is 0. Also, make sure to connect the Type-C cable to the Type-C port of the carrier board. Re-check all pin settings and connections, and then try flashing again. Please refer to the user manual for the pin settings.
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G61M product information in the below link,